Although such posts, I believe, are almost always welcome, and sometime there definitely is a need to keep things secret (as in if you're trying to do something commercially), the majority of requests mention what vocals are needed, and when someone does do the vocals, he or she makes it available for others to listen/use. I'm sure you don't want anyone to steal your idea which is why you're asking for a PM first (maybe also because you only want serious people to undertake the task), and I do not mind it at all, but because you made the request here, could you please ask your vocalist to make the sound available (he may put the sound as a non-commercial attribution if he so wishes) here on the site?If not, could you put the final product here for everyone to listen? (Sometimes you get great feedback from some users on this site).If it's a commercial production, I understand you may not be able to do it, but I'm just curious.